Linux: remove the use of UNIX_PATH_MAX for systems which don't have it.
Linux: remove the use of UNIX_PATH_MAX for systems which don't have it.

Not all kernel headers seem to include UNIX_PATH_MAX. Instead, use
sizeof.

Review URL: http://codereview.chromium.org/48047


git-svn-id: http://src.chromium.org/svn/trunk/src@11821 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 42ad3800c46c3b0a7699c9fe827e3f385f3383ba
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser